Revenue Recognition and Accounts Receivable - Schedule of Net Sales (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition [Abstract]
Product sales	$ 353,087	$ 397,064	$ 395,589
Marketing service fees	53,475	62,891	57,453
Net sales	$ 406,562	$ 459,955	$ 453,042